Originally Posted by

**baumancl**
I am aware of the various issues to consider when powering a motor with a VFD like harmonics, voltage spikes, reflected waves at the motor terminals, cables lengths..etc. I am also have a decent understanding of when to apply filters.

I know that the dv/dt filter takes care of line voltage spikes and that sinewave filters smooth out the the voltage waveform to more closely match a pure sinusoidal power source.

My main question is what is the real difference between a dv/dt filter and a sine wave filter because it seems that some manufacturers "sine wave" filters claim to also address dv/dt problems. Which one is better?

Is there a clear cut way to determine in what situations to apply a dv/dt filter or a sinewave filters? Should they ever be applied together?

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